JPS5713841B2 - - Google Patents
Info
- Publication number
- JPS5713841B2 JPS5713841B2 JP3557273A JP3557273A JPS5713841B2 JP S5713841 B2 JPS5713841 B2 JP S5713841B2 JP 3557273 A JP3557273 A JP 3557273A JP 3557273 A JP3557273 A JP 3557273A JP S5713841 B2 JPS5713841 B2 JP S5713841B2
- Authority
- JP
- Japan
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01413—Reactant delivery systems
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
- C03B37/01473—Collapsing
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/32—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with aluminium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/34—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/40—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/40—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
- C03B2201/42—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn doped with titanium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
- C03B2203/26—Parabolic or graded index [GRIN] core profile
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/12—Drawing solid optical fibre directly from a hollow preform
- C03B2205/16—Drawing solid optical fibre directly from a hollow preform the drawn fibre consisting of circularly symmetric core and clad
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/80—Feeding the burner or the burner-heated deposition site
- C03B2207/85—Feeding the burner or the burner-heated deposition site with vapour generated from liquid glass precursors, e.g. directly by heating the liquid
- C03B2207/86—Feeding the burner or the burner-heated deposition site with vapour generated from liquid glass precursors, e.g. directly by heating the liquid by bubbling a gas through the liquid
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00239496A US3826560A (en) | 1972-03-30 | 1972-03-30 | Method of forming a light focusing fiber waveguide |
| AT608373A AT360192B (en) | 1972-03-30 | 1973-07-10 | METHOD FOR PRODUCING LIGHT-FOCUSING, OPTICAL OBJECTS WITH A COMPOSITION DIFFERENT IN THE RADIAL DIRECTION |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4910055A JPS4910055A (en) | 1974-01-29 |
| JPS5713841B2 true JPS5713841B2 (en) | 1982-03-19 |
Family
ID=25602776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3557273A Expired JPS5713841B2 (en) | 1972-03-30 | 1973-03-28 |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3826560A (en) |
| JP (1) | JPS5713841B2 (en) |
| AT (1) | AT360192B (en) |
| CA (1) | CA995072A (en) |
| DE (1) | DE2313204B2 (en) |
| FR (1) | FR2178172B1 (en) |
| GB (1) | GB1424694A (en) |
| NL (1) | NL171695C (en) |
Families Citing this family (70)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4983453A (en) * | 1972-12-14 | 1974-08-10 | ||
| US3923484A (en) * | 1974-01-11 | 1975-12-02 | Corning Glass Works | Flame method of producing glass |
| US4217027A (en) * | 1974-02-22 | 1980-08-12 | Bell Telephone Laboratories, Incorporated | Optical fiber fabrication and resulting product |
| NL165134B (en) * | 1974-04-24 | 1980-10-15 | Nippon Telegraph & Telephone | METHOD FOR MANUFACTURING A BAR AS AN INTERMEDIATE FOR THE MANUFACTURE OF AN OPTICAL FIBER AND METHOD FOR MANUFACTURING AN OPTICAL FIBER FROM SUCH AN INTERMEDIATE. |
| DE2419786B2 (en) * | 1974-04-24 | 1979-09-06 | Jenaer Glaswerk Schott & Gen., 6500 Mainz | Light guide |
| US3904268A (en) * | 1974-11-15 | 1975-09-09 | Corning Glass Works | Optical waveguide having optimal index gradient |
| US4135901A (en) * | 1974-12-18 | 1979-01-23 | Sumitomo Electric Industries, Ltd. | Method of manufacturing glass for optical waveguide |
| JPS5180241A (en) * | 1975-01-08 | 1976-07-13 | Sumitomo Electric Industries | HIKARIDENSOYOFUAIBAANO SEIZOHOHO |
| JPS5180240A (en) * | 1975-01-08 | 1976-07-13 | Sumitomo Electric Industries | HIKARIDENSOYOFUAIBAANO SEIZOHOHO |
| CA1034818A (en) * | 1975-04-16 | 1978-07-18 | Northern Electric Company Limited | Manufacture of optical fibres |
| US4140505A (en) * | 1976-07-12 | 1979-02-20 | International Standard Electric Corporation | Method of manufacturing a limited mode optical fiber |
| DE2538313C3 (en) * | 1975-08-28 | 1981-11-05 | Heraeus Quarzschmelze Gmbh, 6450 Hanau | Process for the production of a preliminary product for the production of an optical, self-focusing light guide |
| US4339173A (en) | 1975-09-08 | 1982-07-13 | Corning Glass Works | Optical waveguide containing P2 O5 and GeO2 |
| US3966446A (en) * | 1975-10-23 | 1976-06-29 | Bell Telephone Laboratories, Incorporated | Axial fabrication of optical fibers |
| US4038062A (en) * | 1976-03-25 | 1977-07-26 | Bell Telephone Laboratories, Incorporated | Method and apparatus for introducing geometrical perturbations in optical fiber waveguides |
| JPS5838367B2 (en) * | 1976-04-24 | 1983-08-23 | 株式会社フジクラ | Method of manufacturing optical transmission fiber |
| JPS53114818A (en) * | 1977-03-17 | 1978-10-06 | Shinetsu Chemical Co | Production of quartz glass |
| CA1106710A (en) * | 1977-06-22 | 1981-08-11 | Michael G. Blankenship | Method of making optical devices |
| US4334903A (en) * | 1977-08-29 | 1982-06-15 | Bell Telephone Laboratories, Incorporated | Optical fiber fabrication |
| US4358181A (en) * | 1977-09-29 | 1982-11-09 | Corning Glass Works | Gradient index optical waveguide and method of making |
| US4212663A (en) * | 1978-01-26 | 1980-07-15 | Corning Glass Works | Reactants delivery system for optical waveguide manufacturing |
| US4157906A (en) * | 1978-02-21 | 1979-06-12 | Corning Glass Works | Method of drawing glass optical waveguides |
| US4478622A (en) * | 1978-03-03 | 1984-10-23 | Corning Glass Works | Method of making multicomponent optical waveguide having index gradient |
| US4203744A (en) * | 1979-01-02 | 1980-05-20 | Corning Glass Works | Method of making nitrogen-doped graded index optical waveguides |
| US4478623A (en) * | 1979-01-02 | 1984-10-23 | Corning Glass Works | Method of making optimal index profile for multicomponent nonlinear glass optical waveguide |
| US4406517A (en) * | 1979-01-02 | 1983-09-27 | Corning Glass Works | Optical waveguide having optimal index profile for multicomponent nonlinear glass |
| CA1139621A (en) * | 1979-01-05 | 1983-01-18 | Matthew J. Andrejco | Optical fiber fabrication process |
| US4257797A (en) * | 1979-01-05 | 1981-03-24 | Western Electric | Optical fiber fabrication process |
| US4220460A (en) * | 1979-02-05 | 1980-09-02 | Western Electric Company, Inc. | Vapor delivery system and method |
| US4278458A (en) * | 1979-02-07 | 1981-07-14 | Bell Telephone Laboratories, Incorporated | Optical fiber fabrication method and apparatus |
| US4314837A (en) * | 1979-03-01 | 1982-02-09 | Corning Glass Works | Reactant delivery system method |
| US4191545A (en) * | 1979-03-02 | 1980-03-04 | Bell Telephone Laboratories, Incorporated | Optical fiber fabrication process |
| US4235829A (en) * | 1979-05-07 | 1980-11-25 | Western Electric Company, Inc. | Vapor delivery system and method of maintaining a constant level of liquid therein |
| US4341541A (en) * | 1979-07-13 | 1982-07-27 | Times Fiber Communications, Inc. | Process for the production of optical fiber |
| US4298366A (en) * | 1979-07-13 | 1981-11-03 | Times Fiber Communications, Inc. | Graded start rods for the production of optical waveguides |
| DE3037491C2 (en) * | 1979-10-04 | 1983-10-27 | Nippon Telegraph & Telephone Public Corp., Tokyo | Method of manufacturing a glass preform for optical fibers |
| US4344670A (en) * | 1980-05-01 | 1982-08-17 | Corning Glass Works | Optical waveguide soot preform with reduced inner layer stress and method of making |
| US4304583A (en) * | 1980-06-02 | 1981-12-08 | Corning Glass Works | Process for drying optical waveguide preforms |
| JPS5717437A (en) * | 1980-07-01 | 1982-01-29 | Nec Corp | Manufacture of optical fiber |
| IT1145157B (en) * | 1981-06-22 | 1986-11-05 | Cselt Centro Studi Lab Telecom | PROCEDURE AND DEVICE FOR THE IN-LINE DEHYDROGENATION OF PREFORMS FOR OPTICAL FIBERS |
| US4443239A (en) * | 1982-05-20 | 1984-04-17 | International Telephone And Telegraph Corporation | Fabrication of optical waveguides using slurry deposition |
| US4486212A (en) * | 1982-09-29 | 1984-12-04 | Corning Glass Works | Devitrification resistant flame hydrolysis process |
| US4639079A (en) * | 1982-09-29 | 1987-01-27 | Corning Glass Works | Optical fiber preform and method |
| US4576622A (en) * | 1983-11-28 | 1986-03-18 | Lothar Jung | Manufacture of preforms for energy transmitting fibers |
| US4596589A (en) * | 1984-02-09 | 1986-06-24 | Perry Gregory A | Method for producing a single mode fiber preform |
| US4582480A (en) * | 1984-08-02 | 1986-04-15 | At&T Technologies, Inc. | Methods of and apparatus for vapor delivery control in optical preform manufacture |
| CA1260684A (en) * | 1985-03-19 | 1989-09-26 | Koichi Abe | Optical waveguide manufacture |
| US4859375A (en) * | 1986-12-29 | 1989-08-22 | Air Products And Chemicals, Inc. | Chemical refill system |
| US4684384A (en) * | 1986-02-27 | 1987-08-04 | Corning Glass Works | Conveyor deposition method and apparatus for making optical fiber preforms |
| US4772305A (en) * | 1986-06-30 | 1988-09-20 | Corning Glass Works | Process for dewatering porous glass |
| ES2018519B3 (en) * | 1986-08-29 | 1991-04-16 | American Telephone & Telegraph Company | SOOTH COATING METHOD OF AN OPTICAL PREFORM. |
| US4750926A (en) * | 1987-08-07 | 1988-06-14 | Corning Glass Works | Method of making precision shaped apertures in glass |
| GB8905966D0 (en) * | 1989-03-15 | 1989-04-26 | Tsl Group Plc | Improved vitreous silica products |
| US5011566A (en) * | 1989-03-15 | 1991-04-30 | The United States Of America As Represented By The Secretary Of The Air Force | Method of manufacturing microscopic tube material |
| US5043002A (en) | 1990-08-16 | 1991-08-27 | Corning Incorporated | Method of making fused silica by decomposing siloxanes |
| FR2728888B1 (en) * | 1994-12-29 | 1997-01-31 | Alcatel Cable | PROCESS FOR OBTAINING FIBER OPTIC PREFORM USING PLASMA RECHARGE |
| US6474107B1 (en) * | 1996-12-02 | 2002-11-05 | Franklin W. Dabby | Fluorinating an optical fiber preform in a pure aluminum oxide muffle tube |
| US6161398A (en) * | 1998-04-09 | 2000-12-19 | Lucent Technologies, Inc. | Methods of and systems for vapor delivery control in optical preform manufacture |
| US6192713B1 (en) | 1998-06-30 | 2001-02-27 | Sdl, Inc. | Apparatus for the manufacture of glass preforms |
| CA2427103A1 (en) * | 2000-10-26 | 2002-06-06 | Neophotonics Corporation | Multilayered optical structures |
| WO2002084345A1 (en) * | 2001-04-12 | 2002-10-24 | Omniguide Communications | High index-contrast fiber waveguides and applications |
| JP2003171137A (en) * | 2001-11-30 | 2003-06-17 | Fujikura Ltd | Method for manufacturing optical fiber preform |
| KR100474565B1 (en) * | 2002-08-30 | 2005-03-10 | 삼성전자주식회사 | Method and apparatus for supplying a source gas |
| US7011299B2 (en) * | 2002-09-16 | 2006-03-14 | Matheson Tri-Gas, Inc. | Liquid vapor delivery system and method of maintaining a constant level of fluid therein |
| EP1567893A4 (en) * | 2002-11-22 | 2007-09-19 | Omniguide Inc | Dielectric waveguide and method of making the same |
| US20050092030A1 (en) * | 2003-10-31 | 2005-05-05 | Jitendra Balakrishnan | Method and apparatus for depositing glass soot |
| US7536076B2 (en) * | 2006-06-21 | 2009-05-19 | Corning Incorporated | Optical fiber containing alkali metal oxide |
| US20080050086A1 (en) * | 2006-08-24 | 2008-02-28 | Scott Robertson Bickham | Optical fiber containing alkali metal oxide |
| WO2008106046A1 (en) * | 2007-02-28 | 2008-09-04 | Corning Incorporated | Reduction of optical fiber cane/preform deformation during consolidation |
| JP5995923B2 (en) * | 2014-08-06 | 2016-09-21 | 古河電気工業株式会社 | Optical fiber preform and optical fiber manufacturing method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2239551A (en) * | 1939-04-22 | 1941-04-22 | Corning Glass Works | Method of making sealing glasses and seals for quartz lamps |
| GB538995A (en) * | 1939-04-22 | 1941-08-25 | Corning Glass Works | Improved process of making sealing glasses and seals for quartz lamps |
| BE438752A (en) * | 1939-04-22 | |||
| US2967113A (en) * | 1957-11-18 | 1961-01-03 | Gen Electric | Coating method |
| GB1031891A (en) * | 1962-03-06 | 1966-06-02 | Mosaic Fabrications Inc | Improvements in and relating to bundles of glass fibres |
| US3271179A (en) * | 1962-09-24 | 1966-09-06 | Temescal Metallurgical Corp | Method for the manufacture of an optical filter |
| US3614197A (en) * | 1967-04-27 | 1971-10-19 | Semiconductor Res Found | Solid optical wave guide having a radially varying refractive index |
| GB1223805A (en) * | 1969-05-29 | 1971-03-03 | Standard Telephones Cables Ltd | Glass tube manufacture |
| CA951555A (en) * | 1970-05-11 | 1974-07-23 | Robert D. Maurer | Glass optical waveguide |
| US3659915A (en) * | 1970-05-11 | 1972-05-02 | Corning Glass Works | Fused silica optical waveguide |
-
1972
- 1972-03-30 US US00239496A patent/US3826560A/en not_active Expired - Lifetime
-
1973
- 1973-01-19 CA CA161,636A patent/CA995072A/en not_active Expired
- 1973-03-16 DE DE19732313204 patent/DE2313204B2/en not_active Ceased
- 1973-03-28 JP JP3557273A patent/JPS5713841B2/ja not_active Expired
- 1973-03-29 NL NLAANVRAGE7304370,A patent/NL171695C/en not_active IP Right Cessation
- 1973-03-29 FR FR7311328A patent/FR2178172B1/fr not_active Expired
- 1973-03-30 GB GB1543273A patent/GB1424694A/en not_active Expired
- 1973-07-10 AT AT608373A patent/AT360192B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2178172B1 (en) | 1976-09-10 |
| US3826560A (en) | 1974-07-30 |
| AT360192B (en) | 1980-12-29 |
| NL171695B (en) | 1982-12-01 |
| CA995072A (en) | 1976-08-17 |
| DE2313204A1 (en) | 1973-10-18 |
| GB1424694A (en) | 1976-02-11 |
| NL7304370A (en) | 1973-10-02 |
| ATA608373A (en) | 1980-05-15 |
| DE2313204B2 (en) | 1977-12-08 |
| NL171695C (en) | 1983-05-02 |
| FR2178172A1 (en) | 1973-11-09 |
| JPS4910055A (en) | 1974-01-29 |